In the early summer of 1944 Professor S. Horovitz, of the Phytotechnical Institute of Santa Catalina, of Argentina, sent me some seeds of his new sugary (sux)

In the early summer of 1944 Professor S. Horovitz, of the Phytotechnical Institute of Santa Catalina, of Argentina, sent me some seeds of his new sugary (su_x). He and coworkers reported this new sugary in the Anales del Instituto Fitotecnico de Santa Catalina (1941) 3:37-44. He says there that it is on chromosome 6, and that it interacts with su₁ to make su₁ dominant.

The su_x was crossed with su₁ (the inbred, P51) as soon as possible; the F₁ seeds were starchy. Last summer I grew the F₁ and selfed four plants. Five classes of seeds appeared: starchy; su_x, which is waxy looking but stains black with I₂KI; a smooth-sugary seed which is dented and translucent, but not wrinkled; ordinary sugary; and super-sugary (Horovitz's name), which is more wrinkled than ordinary sugary. Not only was there an extra class, but two of the four ears fit an extraordinary ratio, as shown below:

	87 (14) ⊗			87 (3) ⊗
	87B (2) ⊗			87B (5) ⊗

	Obs.	Ratio	Calc.	Obs.	Ratio	Calc.

Starchy	224	8	230.0	312	9	299.5
Sugary - x	61	2	57.5	56	2	66.6
Smooth sugary	35	1	28.8	35	1	33.3
Sugary - 1	83	3	86.3	93	3	100.0
Supersugary	57	2	57.5	37	1	33.3

	x² = 1.84			x² = 3.20

If the four ears are, assumed to be the same and are lumped together, the total counts do not fit either ratio, but are nearer to 8-1/2:2:1:3:1-1/2. The classification of the various kinds of kernels is clear except between sugary and supersugary.

John Shafer, Jr.